71031161 has 2 divisors, whose sum is σ = 71031162. Its totient is φ = 71031160.

The previous prime is 71031127. The next prime is 71031193. The reversal of 71031161 is 16113017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 6325225 = 8044^2 + 2515^2 .

It is an emirp because it is prime and its reverse (16113017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71031161 - 2²² = 66836857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71031361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35515580 + 35515581.

It is an arithmetic number, because the mean of its divisors is an integer number (35515581).

Almost surely, 2^71031161 is an apocalyptic number.

It is an amenable number.

71031161 is a deficient number, since it is larger than the sum of its proper divisors (1).

71031161 is an equidigital number, since it uses as much as digits as its factorization.

71031161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 71031161 is about 8427.9986355006. The cubic root of 71031161 is about 414.1423444961.

Adding to 71031161 its reverse (16113017), we get a palindrome (87144178).

It can be divided in two parts, 7 and 1031161, that multiplied together give a palindrome (7218127).

The spelling of 71031161 in words is "seventy-one million, thirty-one thousand, one hundred sixty-one".